Knife-sharpener



Patented Oct. 4, |898. W. A. HILL.

KNIFE SHARPENER.

L v '.\(`App1ica.tion led Sept. 17, 1897.)

(No Model.)

ERS C0. FNOYO-THO.. WASHINGTON D C UNrTnD STATES PATENT Orrrcn.

IVILFORD A. IIILL, OF VVALTIIAM, MASSACHUSETTS, ASSIGNOR OF ONE- IIALF'TO J. O. MILLER, OF MELROSE, MASSACHUSETTS.

KNIFE-SHARPENER.

SPECIFICATION forming part of Letters Patent No. 611,686, dated October4, 1898.

Application filed September 17,1897. Serial No. 651,976. (N0 mOflcL) Toall whom it may concern.-

Be it known `th-at I, vWILrORD A. HILL, of IValtham, in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Knife- Sharpeners, of which the following is aspecification.

This invention has for its object to provide a simple and efficientknife-Sharpener, whereby a person not possessed of special skill as agrinder may satisfactorily sharpen a knife.

The invention consists in the improvements which I will now proceed todescribe and claim.

Of the accompanying drawings, forming a part of this specification,Figure l represents a top plan view of a knife-Sharpener embodying myinvention. Fig. 2 represents a section on line 2 2 of Fig. l. Fig. 3represents a perspective View of the carrier for the grinding-wheelholder. Fig. 4 represents in separate views the parts of thegrindingwheel holder. Fig. 5 represents a perspective View showing partsof the carrier-guides. Fig. 6 represents a modification.

The same letters of reference indicate the same parts in all thefigures.

In the drawings, a represents a supporting base or bed.

h h represent parallel guides affixed to the base. c represents acarrier fitted to move back and forth on said guides and provided withan operating-handle, preferably extendingparallel with the guides b h',as shown in Fig. 1, where the handle is lettered c. The carrier c isprovided with ears or lianges c2, formed to engage the guides, as shownin Fig. 2.

The carrier c is formed as a bearing in` which may be of emery,sandstone, or other suitable material, rests on a washer d2, interposedbetween a shoulder d3 on the holder A screw d4,

and the under side of the wheel.

formed to engage a tapped orifice in the bod d, clam ps the wheelagainst the washer d2, the

v wheel bein g thus rigidly secured to the holder,

so that both rotate together. The body d has a shoulder or enlargementZ5 at its lower portion, which projects under the carrier c and preventsthe holder and wheel from being raised from the carrier.

f represents a rest affixed to the base a at one side of the path inwhich the wheel-carrier is movable. Said rest has a knife-supportingface arranged to present one side of a knife-blade g to the under sideof the grinding-Wheel, said face being preferably slightly inclined, asshown in Fig. 2, to give the desired bevel to the portion of the bladeon which the wheel acts.

Means are provided for rotating the wheelholder and wheel While they arebeing moved back and forth on the guides ZJ h. As here shown, said meansconsist of a pinion 7L, affixed to the holder, and a rack h', affixed tothe base a, the rack meshing with the pinion. It will be seen,therefore, that the operator by moving the handle c back and forth notonly causes the grinding-wheel e to move back and forth over a bladesupported by the rest, but also causes the rotation of the wheel at thesame time, so that the wheel acts to rapidly grind the blade. b

I prefer to provide means for maintaining ayielding pressure between thegrinding` Wheel and the knife to compensate for wear of the wheel andfor the different thicknesses of the blade. To this end I provide for alimited vertical play of the carrier by making the space between theears c2 greater than the thickness of the guides b b and providing thecarrier with a spring t', which presses downwardly on the carrier andpermits it to yield upwardly. The spring as here shown is a V-shapedpiece of wire attached at its ends to the carrier. The spring projectslaterally from the carrier under the guide h', which is raised from thebed to accommodate the spring. The outer end of the spring bears againsta shoulder or guide j, afiixed to the rest f, said guide holding downthe spring and permitting it to move with the carrier. The springtherefore exerts a downward pressure on the carrier and normally pressesthe grinding-wheel against the rest when there is no blade on thelatter, the spring yielding and permitting the Wheel to be raisedsufliciently to permit the insertion 'of a blade between it and therest.

It will be seen that the axis of rotation of the grinding-wheel issubstantially at a right angle with the direction of movement of thecarrier c, so that the progressive movement of the acting side of thewheel is parallel with the knife-rest, the said acting side maintaininga uniform relation to the knife-rest.

I do not limit myself to the details of conl struction here shown anddescribed and may variously modify the same without departing from thespirit of my invention.

In Fig. 6 I show a modification in which the operating-handle projectsupwardly from the Wheel-holder and comprises a knob c5, mounted looselyon a stud c, which is an extension of the screw d4. Then the knob c5 isgrasped by the operator and moved to move the grinding-wheel carrier,the stud c6 rotates in the knob.

I claim-- 1. A knife-Sharpener comprising a supporting base or bed,parallel guides aiiixed to the bed", a carrier adapted to move on saidguides and having a limited loose vertical motion thereon, a springadapted to exert a yielding downward pressure on the carrier, aknifeholder journaled in the carrier, a grinding wheel or disk afiixedto the holder, and a kniferest adapted to present a knife to the underside of the Wheel.

2. A knife-Sharpener comprising a supporting base or bed, parallelguides aiiixed to the bed, a carrier adapted to move on said guides andhaving a limited loose vertical motion thereon, a spring attached to thecarrier and projecting laterally therefrom, a fixed track or guidearranged to hold down the outer end of the spring, a holder journaled inthe carrier, a grinding Wheel or disk affixed to the holder, and aknife-rest adapted to present a knife to the under side of the wheel.

In testimony whereof I have signed my name to this specificatiomin thepresence of two subscribing witnesses, this 28th day of August, A. D.1897.

W'ILFORD A. HILL.

IVitnesses:

JOHN C. MILLER, C. F. BROWN.

